We walk on "flat" ground every day and rarely think twice—but how flat is it, really? In the city, curbs are chamfered, sidewalks pitch toward grates, and roadways are crowned to shed water into shallow gutters. In suburbs and on unpaved paths, irregular terrain is the norm. Inside buildings, by contrast, we pursue near-perfect horizontality—structural frames, slabs, and finishes are all disciplined to create level walking surfaces in the name of safety and accessibility. Yet flatness is inherently at odds with water. A closer look reveals a quiet repertoire of accommodations: slight falls at entries, thresholds raised a few millimeters, wet areas with barely perceptible pitches. The floor is read as flat, but it is in fact carefully tuned—micro-topographies masquerading as plane—to manage water without calling attention to themselves.

What are the common ways architects "keep things flat" while actually managing water—the perennial enemy of buildings? A useful way to look at it is by zooming into three recurring conditions: exterior or roof decking, bathrooms and other wet rooms, and exterior ground planes. Each relies on a slightly different toolkit—pedestal systems over sloped waterproofing, micro-gradients to floor traps, hidden perimeter drains, split slopes—to maintain the illusion of a seamless, level surface. Studying these situations side by side reveals just how much design effort goes into reconciling perceptual flatness with the messy reality.

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Archinfo, the Information Centre for Finnish Architecture, has announced the theme, curator, and exhibition team for the Pavilion of Finland at the 19th International Architecture Exhibition of La Biennale di Venezia. The exhibition, titled "The Pavilion – Architecture of Stewardship", will focus on the diverse labor involved in constructing and maintaining architecture, from design contributions by architectural workers and engineers to the efforts of construction workers, restoration architects, maintenance staff, and cleaners, all of whom play vital roles in the creation and upkeep of the built environment. Curated by Ella Kaira and Matti Jänkälä from the Helsinki-based architecture practice Vokal, it will use Alvar and Elissa Aalto's Pavilion of Finland to explore architecture as a collaborative endeavor.

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The current demands of the industry lead architects to design based on construction solutions that accelerate processes without compromising quality, while reducing waste and dependence on intensive labor. Among these options, SIP panels stand out as a modular alternative that combines thermal and acoustic insulation with speed and construction precision.

Named after their acronym, SIP panels are self-supporting elements consisting of a rigid foam core sandwiched between two structural claddings, typically OSB boards. Strong yet lightweight, these panels are manufactured under strict factory controls and transported to the construction site, facilitating the rapid assembly of floors, walls, and ceilings, while creating an airtight thermal and acoustic envelope. The thickness of the panel depends on the combined thickness of its components, and its weight typically does not exceed 20 kg per square meter.

Architecture has always played a key role in providing shelter and protection for human beings. In prehistoric times, we sought refuge in caves, taking advantage of rock structures for protection against the natural elements and predators. Over time, shelters began to be made from materials found in nature, such as branches, leaves, and animal skins, evolving into more permanent and complex homes, with walls made of stone, bricks or wood, roofs to protect against rain and sun, and doors to control access. As we developed more advanced building skills, we used materials such as wood, stone, and clay and architecture evolved significantly, with the construction of temples, palaces, and fortifications that provided not only shelter but also symbolized power, status, and cultural identity. Even so, our buildings can continue to be seen as shells that protect us from the outside world. 

From the massive stones of Greek temples to glazed skyscrapers, we work with a range of possibilities and thicknesses to separate what we consider internal and external. This article seeks to explore this diversity of thicknesses in architecture, from simple materials to complex construction techniques, highlighting how this variation not only provides protection but also influences our perception and interaction with the built environment.